Jonga iValve yoMfanekiso omkhulu yenye yezixhobo eziphambili kwinkqubo yokulawula ulwelo.Okwangoku, izicelo eziphambili zevalve zibandakanya i-petroleum kunye negesi, amandla, ubunjineli beekhemikhali, ukunikezelwa kwamanzi kunye nokucocwa kwamanzi amdaka, ukwenza iphepha kunye ne-metallurgy.Phakathi koko, ioyile kunye negesi, amandla kunye neshishini lemichiza ...
Funda ngokugqithisileyo